Short:        Stream editor (text transformation)
Author:       Diomidis Spinellis / University of California, Berkeley (ported by Duncan Bowring)
Uploader:     duncan bowring us
Type:         util/cli
Version:      1.47
Architecture: m68k-amigaos >= 3.0

sed ? Stream editor (text transformation) for AmigaOS

Original author: Diomidis Spinellis / University of California, Berkeley
Ported by Duncan Bowring using amiport (AI-assisted porting toolkit).
Project: https://github.com/bdgscotland/amiport

Cross-compiled with m68k-amigaos-gcc for AmigaOS 3.x (68000+).
Tested in vamos emulator.

Usage:
  sed 's/old/new/' file.txt          Substitute first match per line
  sed 's/old/new/g' file.txt         Substitute all matches
  sed -n '10,20p' file.txt           Print lines 10-20
  sed '/pattern/d' file.txt          Delete matching lines
  echo "hello" | sed 'y/helo/HELO/'  Transliterate characters
  sed -e 's/a/A/' -e 's/b/B/' file   Multiple expressions

Exit codes (Amiga-native):
  0  = success (RETURN_OK)
  10 = error (RETURN_ERROR)

Note: In-place editing (-i) is not supported on AmigaOS (no fdopen).

Includes full source code (original POSIX and ported Amiga versions)
and PORT.md documenting every transformation applied.